Hose joint

Abstract

A thermosetting resin layer covers the outer peripheral surface of the nipple portion of a joint provided on one end of a connecting pipe. A hose having a reinforcing layer between a single- or double-layer inner tube and an outer tube is inserted over the nipple portion of the joint, and tightened by a caulked sleeve or clamp encircling the hose to form a joint structure. This joint structure provides a satisfactory seal for a long period of time, as its resin layer does not undergo any crystallization, but maintains elasticity.

What is claimed is: 
     
       1. A reusable non-adhesive hose joint structure for an automotive fuel line comprising: a hose comprising an inner tube, a reinforcing layer surrounding said inner tube, and an outer tube surrounding said reinforcing layer, said inner tube of said hose comprising at least an inner layer comprised of fluorine rubber;   a hose joint provided on one end of a connecting pipe and having a metallic nipple portion coated with a thermosetting resin which comprises phenolic resin, said thermosetting resin being free if crystallization at temperatures at least as low as -40° C., said nipple portion being disposed within said end of said hose such that said thermosetting resin of said nipple and said fluorine rubber of said hose are disposed in face-to-face contact; and   a member provided around said hose adjacent to said one end thereof for urging said hose in a generally radially inward direction toward said nipple portion, whereby the face-to-face contact between the thermosetting resin and the fluorine rubber provides a maintenance free non-adhesive reusable seal that is effective between -40° C. and 100° C.   
     
     
       2. A joint structure as set forth in claim 1, wherein said resin layer has a thickness of 5 to 100 microns. 
     
     
       3. A joint structure as set forth in claim 2, wherein, said thickness is from 10 to 90 microns. 
     
     
       4. A joint structure as set forth in claim 1, wherein said reinforcing layer is a layer of braided fiber. 
     
     
       5. A joint structure as set forth in claim 1, wherein outer layer that is formed from rubber selected from the group consisting of acrylonitrile-butadiene rubber, epichlorohydrin rubber, acrylic rubber, chlorosulfonated polyethylene rubber and chlorinated polyethylene rubber. 
     
     
       6. A hose joint structure for an automotive fuel line comprising: a hose having an inner tube, a reinforcing layer surrounding said tube and an outer tube surrounding said reinforcing layer, said inner tube including an inner layer comprised of fluorine rubber;   a metallic nipple having opposed inner and outer surfaces, said outer surface being coated with a thermosetting resin comprising phenolic resin, said thermosetting setting having a thickness of between 10 microns and 90 microns and being securely formed on said nipple by baking the coated nipple at a temperature of between 120° C. and 150° C. for between 10 minutes and 60 minutes, said resin being characterized by being free of crystallization at temperatures equal to or above -40° C. and having an elasticity and a rigidity between those of the fluorine rubber and the metallic nipple, said coated nipple being disposed in said hose such that the phenolic resin is disposed in face-to-face contact with the fluorine rubber of the inner layer of the hose; and   a member provided around said hose adjacent to the nipple, said member being operative to urge said hose in a generally radially inward direction toward said nipple, whereby the face-to-face contact between the phenolic resin and the fluorine rubber provides a maintenance free non-adhesive reusable seal that is effective between the temperatures of -40° C. and 100° C.